From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 576B6C47409 for ; Wed, 22 Jan 2020 00:06:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 257CF2465B for ; Wed, 22 Jan 2020 00:06:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iyvIsQd1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728912AbgAVAGR (ORCPT ); Tue, 21 Jan 2020 19:06:17 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:34844 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729027AbgAVAGQ (ORCPT ); Tue, 21 Jan 2020 19:06:16 -0500 Received: by mail-wr1-f68.google.com with SMTP id g17so5434060wro.2; Tue, 21 Jan 2020 16:06:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=h7oPN0fHcma8hj0tfTxFypzTkTs9iot+mzcZU9jYQfA=; b=iyvIsQd17aqujrzVntjSCFkUM+uY+rJXzUF9Ifnmt+lvMk3CzQDRHgzqqiXOH/NzGH 2n5OXIAymKXe3eioxs0mmc87oVrXTUTrmojgrQ4g6WpKS2CeBsUN4TBObYV4EWflJVFe ABi/hI1m/FKYZ55gkkKxEs8R2riCvoYvt5IEJgYUUvmKMNCPkDDQGvk84J98NFDDr8lJ ibw/7+oXCpN8Xw5CA2x7vBufPrxVzZfU0Fy8+dXtfIdEOlwxGVwDtd5FM6dYN9xwZ9bK P2YhohqqkajVsDIr3/PeL46vztd5oDqXoF3qQKgtKvVpEogb9fNlQcIYxed8U3pSGYKT S7nQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=h7oPN0fHcma8hj0tfTxFypzTkTs9iot+mzcZU9jYQfA=; b=XJhqfvJOpimGvj3tOMPKGIxNq+UIkr8kjsFMTY0JlmyD1FBJ9+Vb6QkRlLbxSMucmy L91Do07Vt9kYkLrRyTGBiKoFA2ilyGhtD3ICEyFzCd5wlRud2wEEPOWNNedH61IULj6D RO7NWVxhMV1RaLjbIfbOhEAXvRNGukhx7PG8APmZtbsPtHf9VVGI4xFAFwzENWbe7DH7 lP1he58U0jkaYdz8qbAaa9UC7DbytbyIGlkso+tNAi5hUi6aXuUnFfMDWR/mA6h5fiI1 XgsLZN0Trc/Y/v1F5bWCmB3YJskhnyA+YK9LoquTW3GallBoXpQ1PauRGCi4dmBTEShd 2sVQ== X-Gm-Message-State: APjAAAWOhsUzT4OLrS1MyMaQqCZ1Y33oSesjxZjkT2OVvo+bQxRs09M7 fqnl8q3gr0teNf8GiLGFqvN6CCrW X-Google-Smtp-Source: APXvYqw8K8lxMVwamo2yCxmbHhShPjviREeQ2PUVqFTUN8CPzg5jWYdWXZitKgsVdsl4sTIqEcY4OA== X-Received: by 2002:adf:b605:: with SMTP id f5mr7274714wre.383.1579651573836; Tue, 21 Jan 2020 16:06:13 -0800 (PST) Received: from localhost.localdomain ([109.126.145.157]) by smtp.gmail.com with ESMTPSA id o4sm54527068wrw.97.2020.01.21.16.06.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jan 2020 16:06:13 -0800 (PST) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Alexander Viro Subject: [PATCH 3/3] io_uring: add splice(2) support Date: Wed, 22 Jan 2020 03:05:19 +0300 Message-Id: <8bfd9a57bf42cfc10ee7195969058d6da277deed.1579649589.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Add support for splice(2). Nothing new, just reuse do_splice(). Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 86 +++++++++++++++++++++++++++++++++++ include/uapi/linux/io_uring.h | 16 ++++++- 2 files changed, 100 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index e9e4aee0fb99..44ec9c63c41d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -74,6 +74,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -373,6 +374,15 @@ struct io_rw { u64 len; }; +struct io_splice { + struct file *file_in; + struct file *file_out; + loff_t __user *off_in; + loff_t __user *off_out; + u64 len; + unsigned int flags; +}; + struct io_connect { struct file *file; struct sockaddr __user *addr; @@ -534,6 +544,7 @@ struct io_kiocb { struct io_files_update files_update; struct io_fadvise fadvise; struct io_madvise madvise; + struct io_splice splice; }; struct io_async_ctx *io; @@ -719,6 +730,11 @@ static const struct io_op_def io_op_defs[] = { .needs_file = 1, .fd_non_neg = 1, }, + [IORING_OP_SPLICE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + } }; static void io_wq_submit_work(struct io_wq_work **workptr); @@ -730,6 +746,10 @@ static void io_queue_linked_timeout(struct io_kiocb *req); static int __io_sqe_files_update(struct io_ring_ctx *ctx, struct io_uring_files_update *ip, unsigned nr_args); +static int io_get_file(struct io_submit_state *state, + struct io_ring_ctx *ctx, + int fd, struct file **out_file, + bool fixed); static struct kmem_cache *req_cachep; @@ -2322,6 +2342,61 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt, return ret; } +static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_splice* sp = &req->splice; + + sp->file_out = NULL; + sp->off_in = u64_to_user_ptr(READ_ONCE(sqe->off)); + sp->off_out = u64_to_user_ptr(READ_ONCE(sqe->off_out)); + sp->len = READ_ONCE(sqe->splice_len); + sp->flags = READ_ONCE(sqe->splice_flags); + + if (unlikely(READ_ONCE(sqe->ioprio) || (sp->flags & ~SPLICE_F_ALL))) + return -EINVAL; + + return io_get_file(NULL, req->ctx, READ_ONCE(sqe->fd_out), + &sp->file_out, (sp->flags & IOSQE_SPLICE_FIXED_OUT)); +} + +static bool io_splice_punt(struct file *file) +{ + if (get_pipe_info(file)) + return false; + if (!io_file_supports_async(file)) + return true; + return !(file->f_mode & O_NONBLOCK); +} + +static int io_splice(struct io_kiocb *req, struct io_kiocb **nxt, + bool force_nonblock) +{ + struct io_splice* sp = &req->splice; + struct file *in = sp->file_in; + struct file *out = sp->file_out; + unsigned int flags = sp->flags; + long ret; + + if (force_nonblock) { + if (io_splice_punt(in) || io_splice_punt(out)) { + req->flags |= REQ_F_MUST_PUNT; + return -EAGAIN; + } + flags |= SPLICE_F_NONBLOCK; + } + + ret = do_splice(in, sp->off_in, out, sp->off_out, sp->len, flags); + if (force_nonblock && ret == -EAGAIN) + return -EAGAIN; + + io_put_file(req->ctx, out, (flags & IOSQE_SPLICE_FIXED_OUT)); + io_cqring_add_event(req, ret); + if (ret != sp->len) + req_set_fail_links(req); + io_put_req_find_next(req, nxt); + return 0; +} + /* * IORING_OP_NOP just posts a completion event, nothing else. */ @@ -4044,6 +4119,9 @@ static int io_req_defer_prep(struct io_kiocb *req, case IORING_OP_OPENAT2: ret = io_openat2_prep(req, sqe); break; + case IORING_OP_SPLICE: + ret = io_splice_prep(req, sqe); + break; default: printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", req->opcode); @@ -4272,6 +4350,14 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, } ret = io_openat2(req, nxt, force_nonblock); break; + case IORING_OP_SPLICE: + if (sqe) { + ret = io_splice_prep(req, sqe); + if (ret < 0) + break; + } + ret = io_splice(req, nxt, force_nonblock); + break; default: ret = -EINVAL; break; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 57d05cc5e271..f234b13e7ed3 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -23,8 +23,14 @@ struct io_uring_sqe { __u64 off; /* offset into file */ __u64 addr2; }; - __u64 addr; /* pointer to buffer or iovecs */ - __u32 len; /* buffer size or number of iovecs */ + union { + __u64 addr; /* pointer to buffer or iovecs */ + __u64 off_out; + }; + union { + __u32 len; /* buffer size or number of iovecs */ + __s32 fd_out; + }; union { __kernel_rwf_t rw_flags; __u32 fsync_flags; @@ -37,10 +43,12 @@ struct io_uring_sqe { __u32 open_flags; __u32 statx_flags; __u32 fadvise_advice; + __u32 splice_flags; }; __u64 user_data; /* data to be passed back at completion time */ union { __u16 buf_index; /* index into fixed buffers, if used */ + __u64 splice_len; __u64 __pad2[3]; }; }; @@ -67,6 +75,9 @@ enum { /* always go async */ #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) +/* op custom flags */ +#define IOSQE_SPLICE_FIXED_OUT (1U << 16) + /* * io_uring_setup() flags */ @@ -106,6 +117,7 @@ enum { IORING_OP_SEND, IORING_OP_RECV, IORING_OP_OPENAT2, + IORING_OP_SPLICE, /* this goes last, obviously */ IORING_OP_LAST, -- 2.24.0